78 lines
2.4 KiB
Markdown
78 lines
2.4 KiB
Markdown
|
---
|
||
|
id: 587d825a367417b2b2512c88
|
||
|
title: Reverse a Doubly Linked List
|
||
|
challengeType: 1
|
||
|
videoUrl: ''
|
||
|
localeTitle: ''
|
||
|
---
|
||
|
|
||
|
## Description
|
||
|
undefined
|
||
|
|
||
|
## Instructions
|
||
|
undefined
|
||
|
|
||
|
## Tests
|
||
|
<section id='tests'>
|
||
|
|
||
|
```yml
|
||
|
tests:
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (typeof test == "object")})(), "The DoublyLinkedList data structure exists.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.add == undefined) { return false; }; return (typeof test.add == "function")})(), "The DoublyLinkedList has a method called add.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; if (test.reverse == undefined) { return false; }; return (typeof test.reverse == "function")})(), "The DoublyLinkedList has a method called reverse.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; return (test.reverse() == null); })(), "Reversing an empty list returns null.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(58); test.add(61); test.add(32); test.reverse(); return (test.print().join("") == "326158"); })(), "The reverse method reverses the list.");'
|
||
|
- text: ''
|
||
|
testString: 'assert((function() { var test = false; if (typeof DoublyLinkedList !== "undefined") { test = new DoublyLinkedList() }; test.add(11); test.add(22); test.add(33); test.reverse(); return (test.printReverse().join("") == "112233"); })(), "The next and previous references are correctly maintained when a list is reversed.");'
|
||
|
|
||
|
```
|
||
|
|
||
|
</section>
|
||
|
|
||
|
## Challenge Seed
|
||
|
<section id='challengeSeed'>
|
||
|
|
||
|
<div id='js-seed'>
|
||
|
|
||
|
```js
|
||
|
var Node = function(data, prev) {
|
||
|
this.data = data;
|
||
|
this.prev = prev;
|
||
|
this.next = null;
|
||
|
};
|
||
|
var DoublyLinkedList = function() {
|
||
|
this.head = null;
|
||
|
this.tail = null;
|
||
|
// change code below this line
|
||
|
// change code above this line
|
||
|
};
|
||
|
|
||
|
```
|
||
|
|
||
|
</div>
|
||
|
|
||
|
|
||
|
### After Test
|
||
|
<div id='js-teardown'>
|
||
|
|
||
|
```js
|
||
|
console.info('after the test');
|
||
|
```
|
||
|
|
||
|
</div>
|
||
|
|
||
|
</section>
|
||
|
|
||
|
## Solution
|
||
|
<section id='solution'>
|
||
|
|
||
|
```js
|
||
|
// solution required
|
||
|
```
|
||
|
</section>
|